Neurons responsive to the bird's own song in 45 dph LMANshell and LMANcore. A, Recording from LMANshell. Top, Song spectrograms of a 45 dph BOS, its TUT, and an AMC. Below are raster plots and instantaneous firing rates for a BOS-excited single unit from this recording site; overlaid waveforms are shown in inset. Scale bar, 0.5 ms. * indicates a response that is significantly different from baseline activity. B, Recording from LMANcore of 43 dph bird, arranged as in A showing responses to BOS, REV, and TUT.